Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/hb-ot-var-avar-table.hh @ 46:7ee69f120f19 default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
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1 /*
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2 * Copyright © 2017 Google, Inc.
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3 *
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4 * This is part of HarfBuzz, a text shaping library.
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5 *
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6 * Permission is hereby granted, without written agreement and without
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7 * license or royalty fees, to use, copy, modify, and distribute this
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8 * software and its documentation for any purpose, provided that the
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9 * above copyright notice and the following two paragraphs appear in
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10 * all copies of this software.
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11 *
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12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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16 * DAMAGE.
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17 *
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18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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23 *
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24 * Google Author(s): Behdad Esfahbod
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25 */
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27 #ifndef HB_OT_VAR_AVAR_TABLE_HH
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28 #define HB_OT_VAR_AVAR_TABLE_HH
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30 #include "hb-open-type.hh"
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31 #include "hb-ot-var-common.hh"
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34 /*
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35 * avar -- Axis Variations
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36 * https://docs.microsoft.com/en-us/typography/opentype/spec/avar
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37 */
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38
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39 #define HB_OT_TAG_avar HB_TAG('a','v','a','r')
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42 namespace OT {
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43
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44
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45 /* "Spec": https://github.com/be-fonts/boring-expansion-spec/issues/14 */
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46 struct avarV2Tail
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47 {
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48 friend struct avar;
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49
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50 bool sanitize (hb_sanitize_context_t *c,
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51 const void *base) const
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52 {
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53 TRACE_SANITIZE (this);
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54 return_trace (varIdxMap.sanitize (c, base) &&
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55 varStore.sanitize (c, base));
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56 }
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57
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58 protected:
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59 Offset32To<DeltaSetIndexMap> varIdxMap; /* Offset from the beginning of 'avar' table. */
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60 Offset32To<VariationStore> varStore; /* Offset from the beginning of 'avar' table. */
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61
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62 public:
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63 DEFINE_SIZE_STATIC (8);
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64 };
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66
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67 struct AxisValueMap
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68 {
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69 bool sanitize (hb_sanitize_context_t *c) const
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70 {
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71 TRACE_SANITIZE (this);
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72 return_trace (c->check_struct (this));
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73 }
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74
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75 public:
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76 F2DOT14 coords[2];
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77 // F2DOT14 fromCoord; /* A normalized coordinate value obtained using
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78 // * default normalization. */
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79 // F2DOT14 toCoord; /* The modified, normalized coordinate value. */
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80
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81 public:
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82 DEFINE_SIZE_STATIC (4);
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83 };
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84
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85 struct SegmentMaps : Array16Of<AxisValueMap>
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86 {
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87 int map (int value, unsigned int from_offset = 0, unsigned int to_offset = 1) const
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88 {
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89 #define fromCoord coords[from_offset]
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90 #define toCoord coords[to_offset]
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91 /* The following special-cases are not part of OpenType, which requires
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92 * that at least -1, 0, and +1 must be mapped. But we include these as
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93 * part of a better error recovery scheme. */
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94 if (len < 2)
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95 {
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96 if (!len)
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97 return value;
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98 else /* len == 1*/
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99 return value - arrayZ[0].fromCoord + arrayZ[0].toCoord;
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100 }
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101
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diff changeset
102 if (value <= arrayZ[0].fromCoord)
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diff changeset
103 return value - arrayZ[0].fromCoord + arrayZ[0].toCoord;
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104
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diff changeset
105 unsigned int i;
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parents:
diff changeset
106 unsigned int count = len - 1;
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107 for (i = 1; i < count && value > arrayZ[i].fromCoord; i++)
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108 ;
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109
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diff changeset
110 if (value >= arrayZ[i].fromCoord)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
111 return value - arrayZ[i].fromCoord + arrayZ[i].toCoord;
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112
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113 if (unlikely (arrayZ[i-1].fromCoord == arrayZ[i].fromCoord))
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114 return arrayZ[i-1].toCoord;
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115
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116 int denom = arrayZ[i].fromCoord - arrayZ[i-1].fromCoord;
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117 return roundf (arrayZ[i-1].toCoord + ((float) (arrayZ[i].toCoord - arrayZ[i-1].toCoord) *
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diff changeset
118 (value - arrayZ[i-1].fromCoord)) / denom);
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119 #undef toCoord
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120 #undef fromCoord
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121 }
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122
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123 int unmap (int value) const { return map (value, 1, 0); }
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124
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125 public:
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126 DEFINE_SIZE_ARRAY (2, *this);
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127 };
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128
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129 struct avar
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130 {
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131 static constexpr hb_tag_t tableTag = HB_OT_TAG_avar;
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132
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133 bool has_data () const { return version.to_int (); }
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134
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135 const SegmentMaps* get_segment_maps () const
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136 { return &firstAxisSegmentMaps; }
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137
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138 unsigned get_axis_count () const
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139 { return axisCount; }
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140
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141 bool sanitize (hb_sanitize_context_t *c) const
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142 {
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143 TRACE_SANITIZE (this);
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144 if (!(version.sanitize (c) &&
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145 (version.major == 1
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146 #ifndef HB_NO_AVAR2
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147 || version.major == 2
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148 #endif
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149 ) &&
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150 c->check_struct (this)))
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151 return_trace (false);
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152
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153 const SegmentMaps *map = &firstAxisSegmentMaps;
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154 unsigned int count = axisCount;
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155 for (unsigned int i = 0; i < count; i++)
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156 {
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157 if (unlikely (!map->sanitize (c)))
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158 return_trace (false);
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159 map = &StructAfter<SegmentMaps> (*map);
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160 }
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161
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diff changeset
162 #ifndef HB_NO_AVAR2
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diff changeset
163 if (version.major < 2)
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parents:
diff changeset
164 return_trace (true);
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165
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diff changeset
166 const auto &v2 = * (const avarV2Tail *) map;
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diff changeset
167 if (unlikely (!v2.sanitize (c, this)))
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parents:
diff changeset
168 return_trace (false);
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parents:
diff changeset
169 #endif
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170
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diff changeset
171 return_trace (true);
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172 }
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173
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parents:
diff changeset
174 void map_coords (int *coords, unsigned int coords_length) const
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175 {
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parents:
diff changeset
176 unsigned int count = hb_min (coords_length, axisCount);
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177
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diff changeset
178 const SegmentMaps *map = &firstAxisSegmentMaps;
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179 for (unsigned int i = 0; i < count; i++)
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180 {
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diff changeset
181 coords[i] = map->map (coords[i]);
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diff changeset
182 map = &StructAfter<SegmentMaps> (*map);
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183 }
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184
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parents:
diff changeset
185 #ifndef HB_NO_AVAR2
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186 if (version.major < 2)
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diff changeset
187 return;
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188
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diff changeset
189 for (; count < axisCount; count++)
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parents:
diff changeset
190 map = &StructAfter<SegmentMaps> (*map);
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191
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parents:
diff changeset
192 const auto &v2 = * (const avarV2Tail *) map;
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193
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diff changeset
194 const auto &varidx_map = this+v2.varIdxMap;
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diff changeset
195 const auto &var_store = this+v2.varStore;
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diff changeset
196 auto *var_store_cache = var_store.create_cache ();
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197
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diff changeset
198 hb_vector_t<int> out;
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parents:
diff changeset
199 out.alloc (coords_length);
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parents:
diff changeset
200 for (unsigned i = 0; i < coords_length; i++)
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diff changeset
201 {
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parents:
diff changeset
202 int v = coords[i];
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203 uint32_t varidx = varidx_map.map (i);
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204 float delta = var_store.get_delta (varidx, coords, coords_length, var_store_cache);
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205 v += roundf (delta);
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206 v = hb_clamp (v, -(1<<14), +(1<<14));
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207 out.push (v);
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208 }
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209 for (unsigned i = 0; i < coords_length; i++)
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210 coords[i] = out[i];
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211
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212 OT::VariationStore::destroy_cache (var_store_cache);
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213 #endif
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214 }
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215
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216 void unmap_coords (int *coords, unsigned int coords_length) const
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217 {
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218 unsigned int count = hb_min (coords_length, axisCount);
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219
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220 const SegmentMaps *map = &firstAxisSegmentMaps;
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221 for (unsigned int i = 0; i < count; i++)
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222 {
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223 coords[i] = map->unmap (coords[i]);
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224 map = &StructAfter<SegmentMaps> (*map);
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225 }
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226 }
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227
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228 protected:
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229 FixedVersion<>version; /* Version of the avar table
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230 * initially set to 0x00010000u */
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231 HBUINT16 reserved; /* This field is permanently reserved. Set to 0. */
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232 HBUINT16 axisCount; /* The number of variation axes in the font. This
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233 * must be the same number as axisCount in the
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234 * 'fvar' table. */
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235 SegmentMaps firstAxisSegmentMaps;
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236
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237 public:
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238 DEFINE_SIZE_MIN (8);
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239 };
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240
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241 } /* namespace OT */
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242
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243
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244 #endif /* HB_OT_VAR_AVAR_TABLE_HH */